The Prince Kūhiō Federal Building, formally the Prince Jonah Kūhiō Kalanianaʻole Federal Building and United States Courthouse, is the official seat of the United States federal government and its local branches of various agencies and departments in the state of Hawaiʻi. Its address is 300 Ala Moana Boulevard, Honolulu, Hawaii 96850. The building was completed in 1977 with a total of 929,857 square feet of working space.